EP0538359A1 - Tube for introducing into a body, with a bending mechanism. - Google Patents

Tube for introducing into a body, with a bending mechanism.

Info

Publication number
EP0538359A1
EP0538359A1 EP91913131A EP91913131A EP0538359A1 EP 0538359 A1 EP0538359 A1 EP 0538359A1 EP 91913131 A EP91913131 A EP 91913131A EP 91913131 A EP91913131 A EP 91913131A EP 0538359 A1 EP0538359 A1 EP 0538359A1
Authority
EP
European Patent Office
Prior art keywords
housing
control cables
toothed
tube
toothing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP91913131A
Other languages
German (de)
French (fr)
Other versions
EP0538359B1 (en
Inventor
Der Heide Hendrik Teake Van
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Optische Industrie de Oude Delft NV
Original Assignee
Optische Industrie de Oude Delft NV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Optische Industrie de Oude Delft NV filed Critical Optische Industrie de Oude Delft NV
Publication of EP0538359A1 publication Critical patent/EP0538359A1/en
Application granted granted Critical
Publication of EP0538359B1 publication Critical patent/EP0538359B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M25/00—Catheters; Hollow probes
    • A61M25/01—Introducing, guiding, advancing, emplacing or holding catheters
    • A61M25/0105—Steering means as part of the catheter or advancing means; Markers for positioning
    • A61M25/0133—Tip steering devices
    • A61M25/0136—Handles therefor
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
    • A61B1/005—Flexible endoscopes
    • A61B1/0051—Flexible endoscopes with controlled bending of insertion part
    • A61B1/0052—Constructional details of control elements, e.g. handles

Definitions

  • the invention relates to a tube which can be introduced into the body through a body orifice, said tube being provided with a manipulator for moving at least one pair of control cables through the tube, which manipulator comprises a housing in which for each pair of control cables provision is made for means provided with a toothing which are coupled to said pair of control cables in such a way that when said means are moved the control cables of the relevant pair are moved in opposite directions relative to the housing, the manipulator for each pair of control cables being provided with a control element which is placed outside the housing and is coupled to a toothed wheel placed inside the housing, which toothed wheel is coupled to the means provided with a toothing, in order to permit displacement thereof, and is provided with means to provide a stepwise movement of the means provided with a toothing, which stepwise movement means can be switched off by disconnection means.
  • Such a tube which is also known under the name of an endoscope, is known from US Patent 4,207,873 and is designed to permit manoeuvring of the flexible end of the endoscope into any desired position relative to the body of the endoscope by means of two pairs of cables in the body of a patient.
  • each cable of a pair is fixed to a rack which is movable in the lengthwise direction of the elongated housing, while a single toothed wheel is placed between the pair of racks belonging to one pair of cables, which toothed wheel is connected to a control knob placed outside the housing.
  • the racks are moved in opposite directions relative to the housing, as a result of which one cable is pulled in and the other cable paid out, so that the flexible end of the endoscope is moved in one plane.
  • operation of the two control knobs permits a movement of the flexible end in two planes at right angles to each other and to all positions lying there between.
  • the known device is provided with a mechanism fitted in the interior of each of the control knobs and having spring catches which can engage on a toothed wheel. This mechanism can be put out of action by pulling the relevant knob outwards relative to the housing.
  • the manipulator of the known endoscope is designed so that in virtually all cases it can be operated with one hand by the person operating it, so that the person keeps the other hand free to guide the tube of the endoscope. In practice, however, disconnecting the click mechanism of one or both control knobs with only one hand is found to be extremely difficult.
  • Another disadvantage of the known manipulator is that it is fairly expensive, due to the fact that racks which are labour-intensive to manufacture and thus expensive are used.
  • the. oothed ring forming part of the stepwise movement mechanism is provided in the axial direction with an additional edge serving to prevent accidental movement from the disconnected state to the coupled state, and the provision of such an edge requires an additional operation and is thus expensive.
  • the object of the invention is therefore to provide a tube which is provided with a manipulator 5 which can be controlled without any problem with one hand also for disconnecting the stepwise movement mechanism, and which can also be manufactured considerably more cheaply than the known tube.
  • the invention provides a tube of the above-mentioned type in which the means provided with a toothing comprise a toothed belt which is guided over two toothed wheels, of which the first is the toothed wheel coupled to the control knob and the second is rotatable mounted inside the housing and is connected to the stepwise movement means in order to provide a stepwise movement facility of the toothed belt, said stepwise movement means being accommodated in the housing and being disconnectable by means of a separate control element placed on the outside of the housing.
  • the stepwise movement means preferably comprise a resilient element rigidly connected to the housing and a knurled disc coupled to the second toothed wheel, and the means for disconnecting preferably comprise a cam disc which is rotatable by means of a control element.
  • Figure 1 shows a side view of a cross-section of the manipulator according to the invention
  • Figure 2 shows a side view along the line II-II in Figure 1 of only the movement mechanism for a pair of cables.
  • the manipulator of the tube 30 comprises a housing 1 which is round or rectangular in cross-section and is composed of two parts fixed to each other by, for example, screws.
  • a frame 2 is rigidly fixed to the housing 1, for example by means of screws.
  • the housing has fitted in it two toothed belts 3a and 3b. Toothed belt 3a is guided with the toothed side at one end over a toothed wheel 4a and at the other end over a toothed wheel 4b. In the same way the toothed belt 3b is guided over toothed wheels 5a and 5b.
  • the toothed wheels 4a, 4b and 5a, 5b are rotatable mounted relative to the frame 2, and the toothed wheel 4b is further coupled by means of a hollow shaft 6 to a control knob 7.
  • the toothed wheel 5b is connected by means of a shaft 8 running through a fixed sleeve 6a to a control knob 9.
  • the shaft 6 is guided rotatable in a manner which is known per se through the housing 1 and the fixed sleeve 6a, and the shaft 8 is also rotatable in a manner which is known per se relative to shaft 6, so that the toothed wheels 4b and 5b, and thus the toothed belts 3a and 3b, can be rotated independently of each other by means of control knobs 7 and 9 respectively.
  • a first pair of control cables 10a and 10b is connected to the toothed belt 3a by. means of connecting blocks lla and lib respectively.
  • a second pair of control cables 12a and 12b (not shown in the figure) is connected to the toothed belt 3b by means of connecting blocks 13a and 13b respectively (not shown in the figure) .
  • the connecting blocks are made of, for example, two parts fixed to each other by means of screws, the part lying on the toothed side of the toothed belt at the side facing the toothing preferably also being provided with a corresponding toothing in. order to ensure a correct positioning of the connecting block, while even in operation the connecting block cannot be pulled askew as a result of tensile forces exerted by the cables.
  • control cables 10a, b and 12a, b. it is possible by means of the control cables 10a, b and 12a, b. to move the flexible end 31 of the tube 30.
  • the flexible end 31 of the tube 30 can be fixed in any desired position in the manner described below in connection with the knurled discs 19 and 20.
  • the control cables 10a, b and 12a, b are preferably fixed by their ends to elongated screwed sleeves 14a, b and 15a, b (15b not shown in the figure) , which screwed sleeves are threaded on the outside and fitted rotatable in a corresponding screw thread formed in the connecting blocks.
  • This design which is already known per se in other types of equipment, has the advantage that the cables can be tensioned in a simple manner in order to be able to set the flexible end accurately.
  • the control cables are preferably also guided via screwed sleeves 16a,b and 17a,b (17b not shown in the figure) through the frame 2, the screwed sleeves being rotatable relative to the frame.
  • a sheath 18 of the control cables ends in the open ends of the screwed sleeves facing the front side of the housing, as a result of which a turning of the screwed sleeves 16a,b and 17a,b provides a further adjustment facility for the cables.
  • Knurled discs 19 and 20 are rigidly fixed to the toothed wheels 4a and 5a respectively.
  • the free leg of respective L-shaped resilient elements 21 and 22 can be accommodated in the knurls of the knurled discs 19 and 20, the other leg in each case being rigidly fixed to the frame 2.
  • the peripheries of the cam discs 23 and 24 lie near the ends of the free legs of the resilient elements 21 and 22 respectively.
  • the cam discs are dimensioned in such a way that in the first position of the knobs 25 or 26 the periphery of the cam disc corresponding to said knob is clear of the resilient element, which can consequently fall into a notch of the corresponding knurled disc, so that when the knobs 7 and/or 9 are turned the toothed belts 3a and 3b, and thus the control cables, are moved stepwise due to the fact that the resilient elements always engage in a next notch of the knurled disc.
  • the continuous movement facility also serves to prevent the flexible end from remaining in a fixed curved position on withdrawal of the tube 30 from the body, something which could seriously damage the inside of the body orifice in question.
  • the endoscope can comprise, for example, an optical fibre which is guided through the housing 1, and of which the end comes out at the rear side of the housing, seen on the right in the figure, and is coupled to suitable optical elements to permit looking into the body through the fibre.
  • the flexible end of the endoscope contains an ultrasonic transducer and that the signal cable of said transducer is guided through the housing 1.

Abstract

On décrit un endoscope comportant une ou plusieurs paires de câbles de commande. Ceux-ci fonctionnent à l'aide d'un dispositif de manipulation comprenant un boîtier. Une molette pour chaque paire de câbles de commande est située à l'extérieur du boîtier et est reliée à une roue dentée à l'intérieur du boîtier. Une courroie dentée est enroulée autour de ladite roue dentée et d'une deuxième roue dentée. Les deux câbles de commande en question sont reliés par leurs extrémités à la courroie dentée.An endoscope comprising one or more pairs of control cables is described. These operate using a handling device including a housing. A thumbwheel for each pair of control cables is located outside the housing and is connected to a gear inside the housing. A toothed belt is wound around said toothed wheel and a second toothed wheel. The two control cables in question are connected at their ends to the toothed belt.

Description

Title : TUBE FOR INTRODUCING INTO A BODY, WITH A BENDING MECHANISM
The invention relates to a tube which can be introduced into the body through a body orifice, said tube being provided with a manipulator for moving at least one pair of control cables through the tube, which manipulator comprises a housing in which for each pair of control cables provision is made for means provided with a toothing which are coupled to said pair of control cables in such a way that when said means are moved the control cables of the relevant pair are moved in opposite directions relative to the housing, the manipulator for each pair of control cables being provided with a control element which is placed outside the housing and is coupled to a toothed wheel placed inside the housing, which toothed wheel is coupled to the means provided with a toothing, in order to permit displacement thereof, and is provided with means to provide a stepwise movement of the means provided with a toothing, which stepwise movement means can be switched off by disconnection means.
Such a tube, which is also known under the name of an endoscope, is known from US Patent 4,207,873 and is designed to permit manoeuvring of the flexible end of the endoscope into any desired position relative to the body of the endoscope by means of two pairs of cables in the body of a patient. For this, each cable of a pair is fixed to a rack which is movable in the lengthwise direction of the elongated housing, while a single toothed wheel is placed between the pair of racks belonging to one pair of cables, which toothed wheel is connected to a control knob placed outside the housing. By turning this control knob and the toothed wheel with it, the racks are moved in opposite directions relative to the housing, as a result of which one cable is pulled in and the other cable paid out, so that the flexible end of the endoscope is moved in one plane. Due to the fact that provision is made for two pairs of cables each with its own pair of racks, a toothed wheel and a control knob, operation of the two control knobs permits a movement of the flexible end in two planes at right angles to each other and to all positions lying there between. In order to be able to move and fix the flexible end very accurately, the known device is provided with a mechanism fitted in the interior of each of the control knobs and having spring catches which can engage on a toothed wheel. This mechanism can be put out of action by pulling the relevant knob outwards relative to the housing.
The manipulator of the known endoscope is designed so that in virtually all cases it can be operated with one hand by the person operating it, so that the person keeps the other hand free to guide the tube of the endoscope. In practice, however, disconnecting the click mechanism of one or both control knobs with only one hand is found to be extremely difficult. Another disadvantage of the known manipulator is that it is fairly expensive, due to the fact that racks which are labour-intensive to manufacture and thus expensive are used. Besides, the. oothed ring forming part of the stepwise movement mechanism is provided in the axial direction with an additional edge serving to prevent accidental movement from the disconnected state to the coupled state, and the provision of such an edge requires an additional operation and is thus expensive.
The object of the invention is therefore to provide a tube which is provided with a manipulator 5 which can be controlled without any problem with one hand also for disconnecting the stepwise movement mechanism, and which can also be manufactured considerably more cheaply than the known tube.
To this end, the invention provides a tube of the above-mentioned type in which the means provided with a toothing comprise a toothed belt which is guided over two toothed wheels, of which the first is the toothed wheel coupled to the control knob and the second is rotatable mounted inside the housing and is connected to the stepwise movement means in order to provide a stepwise movement facility of the toothed belt, said stepwise movement means being accommodated in the housing and being disconnectable by means of a separate control element placed on the outside of the housing. The stepwise movement means preferably comprise a resilient element rigidly connected to the housing and a knurled disc coupled to the second toothed wheel, and the means for disconnecting preferably comprise a cam disc which is rotatable by means of a control element. Through the fact that according to the invention use is made of cheap, generally available toothed belts, the tube according to the invention can be made considerably more cheaply than the known tube, and the tube according to the invention, in particular as regards the disconnection of the means for permitting stepwise movement of the toothed belt, can be operated much more easily with one hand, because it need be turned only through a small angle relative to the housing along the housing wall, and does not have to be pulled out relative to the housing, as in the case of the known tube.
Further advantages of the invention will become clear from the description which follows of an example of an embodiment with reference to the drawing. In the drawing: Figure 1 shows a side view of a cross-section of the manipulator according to the invention;
Figure 2 shows a side view along the line II-II in Figure 1 of only the movement mechanism for a pair of cables.
The manipulator of the tube 30 according to the invention, as shown in Figures 1 and 2, comprises a housing 1 which is round or rectangular in cross-section and is composed of two parts fixed to each other by, for example, screws. A frame 2 is rigidly fixed to the housing 1, for example by means of screws. The housing has fitted in it two toothed belts 3a and 3b. Toothed belt 3a is guided with the toothed side at one end over a toothed wheel 4a and at the other end over a toothed wheel 4b. In the same way the toothed belt 3b is guided over toothed wheels 5a and 5b. The toothed wheels 4a, 4b and 5a, 5b are rotatable mounted relative to the frame 2, and the toothed wheel 4b is further coupled by means of a hollow shaft 6 to a control knob 7. The toothed wheel 5b is connected by means of a shaft 8 running through a fixed sleeve 6a to a control knob 9. The shaft 6 is guided rotatable in a manner which is known per se through the housing 1 and the fixed sleeve 6a, and the shaft 8 is also rotatable in a manner which is known per se relative to shaft 6, so that the toothed wheels 4b and 5b, and thus the toothed belts 3a and 3b, can be rotated independently of each other by means of control knobs 7 and 9 respectively.
A first pair of control cables 10a and 10b is connected to the toothed belt 3a by. means of connecting blocks lla and lib respectively. In the same way a second pair of control cables 12a and 12b (not shown in the figure) is connected to the toothed belt 3b by means of connecting blocks 13a and 13b respectively (not shown in the figure) . The connecting blocks are made of, for example, two parts fixed to each other by means of screws, the part lying on the toothed side of the toothed belt at the side facing the toothing preferably also being provided with a corresponding toothing in. order to ensure a correct positioning of the connecting block, while even in operation the connecting block cannot be pulled askew as a result of tensile forces exerted by the cables. It is possible by means of the control cables 10a, b and 12a, b. to move the flexible end 31 of the tube 30. The flexible end 31 of the tube 30 can be fixed in any desired position in the manner described below in connection with the knurled discs 19 and 20. The control cables 10a, b and 12a, b are preferably fixed by their ends to elongated screwed sleeves 14a, b and 15a, b (15b not shown in the figure) , which screwed sleeves are threaded on the outside and fitted rotatable in a corresponding screw thread formed in the connecting blocks. This design, which is already known per se in other types of equipment, has the advantage that the cables can be tensioned in a simple manner in order to be able to set the flexible end accurately. The control cables are preferably also guided via screwed sleeves 16a,b and 17a,b (17b not shown in the figure) through the frame 2, the screwed sleeves being rotatable relative to the frame. A sheath 18 of the control cables ends in the open ends of the screwed sleeves facing the front side of the housing, as a result of which a turning of the screwed sleeves 16a,b and 17a,b provides a further adjustment facility for the cables.
Knurled discs 19 and 20 are rigidly fixed to the toothed wheels 4a and 5a respectively. The free leg of respective L-shaped resilient elements 21 and 22 can be accommodated in the knurls of the knurled discs 19 and 20, the other leg in each case being rigidly fixed to the frame 2. Provision is also made for cam discs 23 and 24, which are rotatable mounted in the housing 1 and can be turned by knobs 25 and 26 respectively from a first position to a second position. The peripheries of the cam discs 23 and 24 lie near the ends of the free legs of the resilient elements 21 and 22 respectively. The cam discs are dimensioned in such a way that in the first position of the knobs 25 or 26 the periphery of the cam disc corresponding to said knob is clear of the resilient element, which can consequently fall into a notch of the corresponding knurled disc, so that when the knobs 7 and/or 9 are turned the toothed belts 3a and 3b, and thus the control cables, are moved stepwise due to the fact that the resilient elements always engage in a next notch of the knurled disc. In the second position of the cam disc 23 or 24 it lies against the resilient element 21 or 22 and presses it away until it is outside the periphery of the knurled disc in question, as a result of which the cables can be moved continuously and, if desired, rapidly by turning the knobs 7 and/or 9, for example in order to take the flexible end of the endoscope quickly to the vicinity of the position in the body to be examined, following which turning the knob 25 and/or 26, which can easily be carried out with one finger of the hand holding the housing, makes it possible to change over to the stepwise movement of the toothed belts, to permit accurate seeking of the end position.
The continuous movement facility also serves to prevent the flexible end from remaining in a fixed curved position on withdrawal of the tube 30 from the body, something which could seriously damage the inside of the body orifice in question.
In the above a description, is given of a tube according to the invention, without details being given concerning the design of the actual endoscope and the flexible end thereof, but these parts need no further explanation because they can have different designs which are well-known in professional circles. The endoscope can comprise, for example, an optical fibre which is guided through the housing 1, and of which the end comes out at the rear side of the housing, seen on the right in the figure, and is coupled to suitable optical elements to permit looking into the body through the fibre. Another possibility is that the flexible end of the endoscope contains an ultrasonic transducer and that the signal cable of said transducer is guided through the housing 1. Finally, it is also pointed out that, although the example of an embodiment described has a manipulator with two pairs of control cables, the principle of the invention is also applicable without further ado if only movements in one plane need be carried out, for which a tube which is provided with a manipulator then has only one pair of control cables.

Claims

1. Tube which can be introduced into the body through a body orifice, said tube being provided with a manipulator for moving at least one pair of control cables through the tube, which manipulator comprises a housing in which for each pair of control cables provision is made for means provided with a toothing which are coupled to said pair of control cables in such a way that when said means are moved the control cables of the relevant pair are moved in opposite directions relative to the housing, the manipulator for each pair of control cables being provided with a control element which is placed outside the housing and is coupled to a toothed wheel placed inside the housing, which toothed wheel is coupled to the means provided with a toothing, in order to permit displacement thereof, and is provided with means to provide a stepwise movement of the means provided with a toothing, which stepwise movement means can be switched off by disconnection means, charac- terised in that the means provided with a toothing comprise a toothed belt which is guided over two toothed wheels, of which the first is the toothed wheel coupled to the control knob and the second is rotatable mounted inside the housing and is connected to the stepwise movement means in order to provide a stepwise movement facility of the toothed belt, said stepwise movement means being accommodated in the housing and being disconnectable by means of a separate control element placed on the outside of the housing.
2. Tube according to Claim 1, in which two pairs of control cables are provided, characterised in that for each of the two pairs of control cables a toothed belt and two toothed wheels are provided.
3. Tube according to Claim 1 or 2, characterised in that the stepwise movement means comprise a resilient element rigidly connected to the housing and a knurled disc coupled to the second toothed wheel, and that the means for disconnecting comprise a cam disc which is rotatable by means of a control element.
4. Tube according to Claims 1, 2 or 3 characterised in that the control cables are connected by means of connecting blocks to the toothed belt, and in that a connecting block is provided with a toothing corresponding to the toothing of the toothed belt, by means of which the connecting block engages on the toothed belt.
5. Tube according to Claim 4, characterised in that the control cables are adjustably connected to the connecting blocks by means of screwed sleeves rotatably mounted in the connecting blocks.
6. Manipulator of the type described in any of Claims 1, 2, 3, 4, or 5.
EP91913131A 1990-07-09 1991-07-08 Tube for introducing into a body, with a bending mechanism Expired - Lifetime EP0538359B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL9001564A NL9001564A (en) 1990-07-09 1990-07-09 BODY CONTAINABLE TUBE EQUIPPED WITH A MANIPULATOR.
NL9001564 1990-07-09

Publications (2)

Publication Number Publication Date
EP0538359A1 true EP0538359A1 (en) 1993-04-28
EP0538359B1 EP0538359B1 (en) 1994-03-16

Family

ID=19857390

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91913131A Expired - Lifetime EP0538359B1 (en) 1990-07-09 1991-07-08 Tube for introducing into a body, with a bending mechanism

Country Status (6)

Country Link
US (1) US5388568A (en)
EP (1) EP0538359B1 (en)
JP (1) JPH05508572A (en)
DE (1) DE69101441T2 (en)
NL (1) NL9001564A (en)
WO (1) WO1992000696A1 (en)

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DE69101441T2 (en) 1994-10-06
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US5388568A (en) 1995-02-14
JPH05508572A (en) 1993-12-02
WO1992000696A1 (en) 1992-01-23
NL9001564A (en) 1992-02-03

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